Lock.



PATENTED OCT. 1'7, 1905.

M. F. WALGK.

LOCK.

APPLICATION FILED 920.31. 1904.

lfTD STAES PATNT FFTE.

Specification of Letters Patent.

Patented Oct. 1'7, 1905.

Application filed December 31, 1904:. Serial No. 239,101.

To It 111700112, it may concern:

Be it known that LMURRAY F.VVALo1(,a citizen of the United States, residing at Enhaut, in the county of Dauphin and State of Pennsylvania, have invented new and useful 1m provements in Locks, of which the following is a specification.

This invention relates to locks.

The objects of the invention are to improve and simplify the construction of such devices; furthermore, to increase their efficiency in operation and to decrease the expense attending their manufacture.

With the foregoing and other objects in View, which will appear as the description proceeds, the invention resides in the novel combination and arrangement of parts and in the details of construction hereinafter described and claim ed as a practical embodiment thereof.

In the accompanying drawings, forming a part of this specification, Figure 1 is a plan view ofa lock with the cover-plate of the casing removed, the bolt being shown in retracted or unlocked position. Fig. 2 is a similar view showing the bolt in partially-advanced position. Fig. 3 is a similar view showing the bolt in locked position. Fig. 1 is a similar view showing the position of the key preparatory to unlocking or retracting the bolt. Fig. 5 is a section on the line 5 5 of Fig. 1. Fig. 6 is a detail view of a key.

Like reference-numerals indicate correspending parts in the different views.

The reference-numeral 1 indicates the casing, which may he of any suitable size and construction. The bolt 2 is adapted to be raised and moved forward or backward in the manner hereinafter described. Formed upon one side of the bolt 2 is a shoulder 3, a short lug 4:, having its rear end beveled, a long lug 5, having its rear end beveled, and a rounded key-engaging lug 6. Formed upon the opposite side of the bolt 2 is a spring-receiving lug 7 and a retracting'lug 8, having its rear face beveled, as shown. Attached to the upper end of-the casing 1 is a flat spring 9, which extends forward and bears at its free end against the spring-receiving lug 7.' The bolt 2 is guided in its irregular sliding movements by a pair of limiting-pins 10 and 11, which are disposed on the underside thereof, and :1 limiting-pin 12, which is arranged thereabove. The limiting-pin ll preferably is shorter than the pin 12, so as to be cleared by the cutaway portion 13 of the key-engaging lug 6, as shown in Fig. 5, when the bolt is moved to its extreme rearward position in opening or closing the door to which the lock is attached.

The key 14:, which extends through the keyhole 15, is adapted to engage the lug 6 to raise the bolt so that the short lug 4 will clear the limiting-pin 10. As soon as the bolt 2 has been raised and moved forward by the key 1 L the spring 9 will force said bolt downward so that the limiting-pin 10 will be disposed between the short lug i and the long lug 5, as shown in Fig. 3, the lug 5 serving to limit the forward movement of the boltand thelug 4 serving to prevent accidental rearward movement thereof. In retracting the bolt from its locked position the key 14 is of course turned in the opposite direction and serves to raise the bolt and move it rearward, after which the spring 9 holds it against the limiting-pins 10 and 11.

When the bolt 2 is in its scmiretracted or unlocked position, as shown in Figs. 1 and 1, the retracting-lug 8 is in the path of movement of an arm 15, mounted upon the usual handle member 16, to which the door-knob is attached. It will be understood that when the handle member 16 is rotated the forward beveled end 17 of the bolt 2 is retracted entirely within the casing, so as to permit the door to which the lock is attached to be opened or closed. The upward movement of the arm 15 is limited by a pin 17.

A lug, such as 18, may be arranged adjacent to the keyhole 15, so as to render necessary the use of a particular form of key with the lock.

The improved lock of this invention is extremely strong, simple, durable, and inexpensive in construction, as well as thoroughly efiicient in operation.

Changes in the precise embodiment of invention illustrated and described may be made within the scope of the following claims with out departing from the spirit of the invention or sacrificing any of its advantages. 7

Having thus described the invention, what is claimed as new is 1. A look comprising a casing, a bolt adapted to move laterally and longitudinally in said casing, said bolt having on one side a shoulder, a short lug, a long lug, and a key-engaging lug, and said bolt having on the other side a spring-receiving lug and a retracting-lug, a spring fastened to the casing and bearing against the spring-receiving lug, limiting-pins in said casing adjacent to the bolt, and a handle member having an arm adapted to engage the retracting-lug of said bolt.

2. A look comprising a casing, a bolt adapted to move laterally and longitudinally in said casing, said bolt having on one side a shoulder, a short beveled lug, a long beveled lug, and a rounded key-engaging lug formed with a cut-away portion, said bolt having on the other side a spring-receiving lug and a bev' eled retracting-lug, a flat spring fastened at its rear end to the casing and bearing at its forward end against the spring-receiving lug, 

